JPS6319974Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a tape cassette equipped with a brake mechanism for preventing loosening of a tape such as a video tape incorporated in the cassette.

(Purpose) The present invention provides a brake mechanism that is installed, for example, between a supply reel and a take-up reel in a tape cassette and has a function of preventing the tape from loosening. It is an object of the present invention to provide a tape cassette that can be reliably held in the body and has good assembly workability.

(Prior Art) Conventionally, a tape cassette equipped with this type of brake mechanism is constructed as shown in FIGS. 1 and 2.

FIG. 1 is an exploded perspective view of the brake mechanism, and FIG. 2 is an explanatory view of the brake mechanism shown in FIG. So, supply side reel A
The brake mechanism C disposed between the reel B and the take-up side reel B is roughly composed of a brake release lever 2 and a pair of brake levers 3a and 3b.

The brake release lever 2 includes a rotating plate 5 having a rotating shaft 4 and a pair of arm portions 6 erected on this shaft 4.
a and 6b, and is rotatably supported by bearing portions of ribs 7a and 7b provided on the lower half 1.

The pair of brake levers 3a, 3b are provided with arms 9a, 9b formed in a substantially L-shape including cylindrical sleeves 8a, 8b.
a and 8b are rotatably supported by a pair of studs 10a and 10b implanted in the lower half 1, and one end engaging portions 9a ₁ and 9b ₁ of these arms 9a and 9b are connected to the brake release lever 2. The supply side reel A and the take-up side reel B are locked by engaging the arm portions 6a and 6b, respectively, and inserting the other end engaging portions 9a ₂ and 9b ₂ into the notches 1a and 1b provided in the reel guide wall. They are respectively engaged with engaging portions provided on the outer periphery.

11a, 11b are the studs 10a, 10
b, and the pair of brake levers 3a, 3
This is a torsion spring that has a pair of hook parts and a coil part that apply rotational force in a predetermined direction to b.

Here, to explain the process of assembling the conventional brake mechanism C configured in this way into the cassette case, first move the brake release lever 2 from above the lower half 1 so that its shaft 4 is inserted into the bearings of the ribs 7a and 7b. This brake lever 2 is housed in the lower half 1 by fitting it into the lower half 1.

Next, the sleeves 8a and 8b of the pair of brake levers 3a and 3b are attached to the stud 10.
a, 10b, and at the same time, one end engaging portion 9a ₁ , 9b ₁ of the arm portion 6 of the brake release lever 2.
a, 6b, and the other end engaging portion 9a ₂ ,
_9b2 is engaged with the engaging portions of both tape reels A and B through the notches 1a and 1b of the reel guide wall.
After that, the coil portions of the springs 11a, 11b are locked to the studs 10a, 10b, and the hook portions of one end thereof are locked to the lower half 1, and the hook portions of the other ends are connected to the engaging portions of the brake levers 3a, 3b. 9
By locking one end of a ₁ and 9b ₁ , the brake levers 3a and 3 are locked as shown by arrows D and E in FIG.
Rotation force is applied to b, and this brake mechanism C is
It is finally assembled and maintained in the lower half 1 in a state in which it is in operation and the tape is prevented from loosening, and therefore, when it is closed with the upper half 1 (not shown), it becomes a completed cassette housing. .

When this tape cassette is inserted into the device body, the rotary plate 5 is rotated by a projection (not shown) inside the device body, and each brake lever 3a, 3
b are simultaneously rotated against the elastic force of torsion springs 11a and 11b, and the engagement between this lever and both tape reels A and B is released, allowing the reels to rotate.

However, in assembling this brake mechanism, when assembling the springs 11a and 11b, in particular, with one end hook portion of the first spring 11a locked to the lower half 1, the other end hook portion is attached to the brake lever 3a.
When the brake lever 3a is engaged with the engaging portion _9a1 of the lever 3a, the brake lever 3a, which is engaged with the brake release lever 2 which is in the free state and both tape reels A and B which are also in the free state, becomes unstable. When the brake release lever 2 is locked (engaged) in a state of The shaft 4 easily separates from the bearing portions of the ribs 7a and 7b, making assembly very difficult.
Furthermore, even when the springs have been installed, the brake levers 3a and 3b are simply locked to the arms 6a and 6b, so that when some external force is applied to the lower half 1, This has drawbacks such as easy disengagement.

(Embodiment of the invention) The present invention has been devised in view of the above-mentioned drawbacks, and will be explained in detail with reference to an embodiment shown below.

In addition, the present invention is a brake release lever shown in the conventional example that has a special shape, and the assembly process is the same as that of the conventional example.
Components that are the same as those in the prior art are designated by the same reference numerals, and the specific structure thereof will be omitted, and only that point will be explained below.

FIG. 3 is a perspective view of a brake release lever showing the main parts of the brake mechanism of the tape cassette according to the present invention;
FIG. 4 is an explanatory diagram showing a state in which the brake release lever shown in FIG. 3 is assembled into the lower half 1 to assemble the brake mechanism.

In both figures, the brake release lever 12 includes a rotary plate 14 having a shaft 13 and a rotary plate 14 that holds the rotary plate 14 between the shafts 1 and 14.
A pair of arm portions 15a, 15b erected above 3
and is constructed between both arm portions 15a and 15b,
The rotary plate 14 and a beam 17 having a protrusion 16 protruding on the opposite side are integrally formed approximately at the center thereof using, for example, synthetic resin. The amount of protrusion of this protrusion 16 is set to such a length that both tape reels A and B can be unlocked.

Further, although the pair of arm portions 15a and 15b are connected in a U-shape by the beam 17, they may be formed from a single plate and a projection portion may be provided approximately at the center thereof.

Brake release lever 12 configured in this way
is assembled into the lower half 1 by a process similar to the above-described assembly process. That is,
After attaching the brake levers 3a and 3b to the predetermined positions, first, with one end hook portion of the first spring 11a locked to the lower half 1, the other end hook portion is attached to one engaging portion of the brake lever 3a. _9a1 , this brake release lever 12 receives the same force as above and tries to float upward, but
At that time, the protrusion 16 is connected to the engaging portion 9 of the brake lever 3a.
Since it comes into contact with a ₁ and its movement is restricted, the shaft 13
can be prevented from coming off from the bearing portions of the ribs 7a, 7b of the lower half 1. Therefore, since the brake release lever 12 is maintained in a stable state within the lower half 1, the second spring 11b can be easily attached to the brake lever 3b on the opposite side.
These assembly operations can always be performed in a stable state. Moreover, since this brake release lever 12 is in a state where it can be mutually supported from the left and right by the engaging parts 9a ₁ and 9b ₁ , it will not easily disassemble even if an external force is applied to the lower half 1. .

(Effects) As described above, the tape cassette according to the present invention has
A tape cassette having a brake mechanism provided between a supply reel and a take-up reel on which tape is wound, having a rotating shaft,
A rotating plate that is rotated by a protrusion inside the device body when inserted into the device body, an arm that stands above the rotating plate, and an arm that is attached to the approximate center of the arm. A brake release lever is integrally formed with a protrusion protruding in the direction of rotation of the rotating plate, and an engaging part at one end is engaged with the arm part with the protruding part in between, and an engaging part at the other end is engaged with the arm part. a pair of brake levers that engage with engaging portions provided on the supply side reel and the take-up side reel, and are rotationally biased by elastic means, and as the brake release lever rotates. No, the brake lever rotates against the elastic force of the elastic means to release the engagement between the other end engaging portion provided on the brake lever and the engaging portions provided on both tape reels. As a result, the brake release lever does not come off from the lower half during assembly, unlike in the past, so the brake mechanism can be assembled stably, and the brake mechanism can be reliably held within the cassette housing. It has many practical advantages.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing a conventional brake mechanism, Figure 2 is a partial perspective view showing the brake mechanism in Figure 1 assembled into the lower half, and Figure 3 is the main part of the present invention. FIG. 4 is a perspective view showing the brake release lever, and FIG. 4 is an explanatory view showing a state in which the brake release lever of FIG. 3 is assembled into the lower half. 1... Lower half, 2, 12... Brake release lever, 3a, 3b... Brake lever, 4, 13...
Shaft, 5, 14...Rotating plate, 6a, 6b, 15a,
15b... Arm portion, 9a ₁ , 9b ₁ , 9b ₂ , 9b ₂ ... Engaging portion, 11a, 11b... Torsion spring, 16... Projection, A... Supply side reel, B... Take-up side reel .

Claims (1)

[Scope of utility model registration request] A tape cassette with a brake mechanism is installed between a supply reel and a take-up reel on which tape is wound. a rotating plate that is rotated by the rotating plate; an arm that stands above the rotating plate; and a protrusion that is provided approximately in the center of the arm so as to protrude in the rotating direction of the rotating plate. a brake release lever that is integrally formed with a brake release lever, and an engaging portion that engages the engaging portion at one end with the arm portion with the protrusion sandwiched therebetween, and the engaging portion at the other end is provided on the supply side reel and the take-up side reel. It consists of a pair of brake levers that are engaged with each other and are rotationally biased by elastic means, and as the brake release lever rotates,
The brake lever is configured to rotate against the elastic force of the elastic means to release the engagement between the other end engaging portion provided on the brake lever and the engaging portions provided on both tape reels. A tape cassette characterized by: